Advanced Materials Research Vols. 415-417

Abstract: First-principles plane-wave pseudopotential calculations of the electron structure and energetics of the interfaces of clean and Ni-doped TiC/Fe are reported. We predicted the atomic structure, bonding, and the interface binding energy of TiC(100)/Fe(100) and TiC(100)/Fe(110). By comparing the interface bonding energy and the total charge density distribution, the interface have priority to combine in TiC(100)/Fe(100) and TiC(100)/Fe(110) ways, where the former’s interface binding energy is higher. So the structure of TiC(100)/Fe(100) is more stable. The doped Ni atoms have preferential access to Fe-based body and form FeNi alloy, and enhance the interface bonding energy, thus effectively reducing the system energy of TiC(100)/Fe(100) and TiC(100)/Fe(110) interfaces, increasing the bonding strength and stability of interfaces of the composite materials.

Abstract: A wear resistant TiC-Cr₇C₃ /Fe surface composite was produced by cast technique and in-situ synthesis technique. The microstructure and dry-sliding wear behavior of the surface composite was investigated using scanning electron microscope(SEM), X-ray diffraction(XRD) and MM-200 wear test machine. The results show that the surface composite consists of TiC and Cr₇C₃ as the reinforcing phase, α-Fe and γ-Fe as the matrix. The surface composite has excellent wear-resistance under dry-sliding wear test condition with heavy loads.

Abstract: Manganese ions doped Pani films were prepared by using a cyclic voltammetry technique on mild steel substrate. Corrosion resistances performances of them in 0.5 M H₂SO₄ solution were obtained by using electrochemical impedance spectroscopy (EIS), polarization curve, and SEM method. The results showed that manganese ions doped Pani particles became smaller and tighter, the resistance reduced, and the corrosion potential rose than Pani in H₂SO₄ solution.

Abstract: Platinum/carbon black (Pt/CB) was prepared from Tetraammineplatinum (II) chloride hydrate (Pt compound), carbon black and ethyl cellulose by ultrasonic method. The effects of platinum compound loading and drying temperature on the result products were investigated. The synthesized Pt/CB powder were used for coating on fluorine-doped tin oxide (FTO) conductive glasses and tested for electrical conductivity properties. The result products were characterized in term of chemical composition and microstructure by X-ray diffraction (XRD), scanning electron microscope technique (SEM), EDX (JEOL,JSM 5800 LV), X-ray fluorescence spectrometry (XRF) (PHILIPS PW2400) and TEM analyses.

Abstract: Nitrile Butadiene Rubber (NBR) is a kind of common sealing materials for the electric hydraulic servo mechanism, there exists the aging failure problem in its storage environment, which is the key factor determining the storage life of the electric hydraulic servo mechanism. Through the analysis of aging failure mechanism of the NBR o-ring, the degradation path that varies with the changes of aging time based on compression set was established. And the Arrhenius equation, which is the acceleration equation of the aging reaction velocity varies with the changes of temperature, was established as well. In order to obtain the related parameters of the model, the accelerated aging test was conducted and its data were processed by applying the approximation standards and least square method. Also through the test the prediction of storage life of NBR o-ring under special storage conditions was made, and its predicted results were basically identical with the actual storage life.

Abstract: In our study, a new kind of material for oil adsorption was prepared by melt blending with EPDM as the matrix and roasting Fe₂O₃ as the filler. By considering the influence of pH, temperature, stirring speed on adsorption capacity. The results showed that the environmental pH has little effect on the crude oil absorbency of the composite; “Room temperature” is the optimum temperature; increased the stirring speed can reduce the adsorption time.

Abstract: Metal ions doped complex cobalt blue pigments are prepared by homogeneous precipitation, to investigate the effects of doping ions Zn²⁺ ，Mg²⁺ ，Ni²⁺ and Y ³⁺ on some properties of the doped complex cobalt blue pigments, such as crystal structure, color, shading power and temperature resistance. Studies have shown that doping have little effect on the spinel crystal type and temperature resistance of the pigments ; ionic radius differences between doping ions and Co^{2 +} cause lattice distortion and changes of lattice constant , thus affecting the ligand state spaces of Co^{2 +} ion, color and shading power of complex cobalt blue pigment. The lattice constant of Zn^{2 +} doped complex cobalt blue becomes larger with the increasing amount of Zn^{2 +} ; while doping Mg^{2 +}and Ni^{2 +} , the crystal lattice constants become smaller; when doping with Y^{3 +} , Y^{3 +} ions enter into CoAl₂O₄ lattice, replacing some hexa-coordinate octahedral gap of Al^{3 +} , ionic radius differences between Y^{3 +} and Al³⁺cause lattice distortion, when doping amount of Y ^{3 +} increases to a certain extent, the phase in the form of Y₂O₃ will be generated and it will maybe form a kind of CoY_xAl_2-xO₄- Y₂O₃ solid solution instead of the complete spinel structure.

Abstract: By using dynamic capillary and multi-dimensional vibration experiment desktop, isotactic polypropylene ( iPP ) is selected for the objective material to investigate the effect of the vibration parameters on the viscoelastic properties of polymer and its molding process. And a series conclusions can be draw that: The phase angle of polymer tends to decrease after a increase with vibration frequency increasing. The phase angle reach maximum value of 90° when the vibration frequency equals to the material natural frequency. Which polymer experience as pure viscous materials, also hysteresis heat build-up rate goes up to the peak. The plasticizing rate of polymer increase as the vibration amplitude, but the higher requirement for the equipment leveled up as well. The polymer plasticizing rate display the same law with that of phase angle against vibration frequency. When the vibration frequency equals to the material natural frequency, the plasticizing rate reach maximum. The investigation of this study will offers valuable theoretical references for polymer processing and novel equipment design in low-temperature.

Abstract: The process of TiCl₄ treatment on the FTO substrate of DSSC were analyzed and the microstructures of substrates before and after treatment were observed. Further more, the influence of TiCl₄ treatment on the substrate of Dye-sensitized solar cell to photo-current voltage performance was numerical analyzed.

Abstract: In this paper, a new multi-direction three-dimensional fabric, called in-plane quasi-isotropic fabric, including warps 0, wefts 90o, a set of bias yarns ±45o, and a vertical yarns Z fastening the other yarns together is designed. Unit cell models are established on the basis of the rule of yarn movement and on the basis of optimizing the yarn cross section on the method of braiding-solidify-cutting-polishing-viewing. Mathematical relationship of the parameters with geometry parameters is founded and the fiber volume content is calculated, the valid relationship is proved by experimental results.